DP Biology (last assessment 2024)

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Question 17N.1.SL.TZ0.23

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Date November 2017 Marks available [Maximum mark: 1] Reference code 17N.1.SL.TZ0.23
Level SL Paper 1 Time zone TZ0
Command term Deduce Question number 23 Adapted from N/A
23.
[Maximum mark: 1]
17N.1.SL.TZ0.23

The table shows the number of differences between humans and other selected organisms for the protein cytochrome c oxidase. This protein, consisting of 104 amino acids, is located in the mitochondria and functions as an enzyme during cell respiration.

If the data were used to draw a cladogram, which chordates would be furthest apart from humans?

A. Chimpanzee because it has zero differences

B. Fruit fly because it has the most differences

C. Tuna fish because it is the chordate with the most differences

D. Horse because it is in the same class

[1]

Markscheme

C

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